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https://github.com/sheumann/hush.git
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Make lash smaller. (Use llist_t for file closing, and different allocation
functions.)
This commit is contained in:
Rob Landley
parent
7c7b0d7437
commit
f946379599
95
shell/lash.c
95
shell/lash.c
@ -109,11 +109,6 @@ struct built_in_command {
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int (*function) (struct child_prog *); /* function ptr */
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};
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struct close_me {
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int fd;
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struct close_me *next;
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};
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/* function prototypes for builtins */
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static int builtin_cd(struct child_prog *cmd);
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static int builtin_exec(struct child_prog *cmd);
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@ -129,9 +124,6 @@ static int builtin_read(struct child_prog *cmd);
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/* function prototypes for shell stuff */
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static void mark_open(int fd);
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static void mark_closed(int fd);
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static void close_all(void);
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static void checkjobs(struct jobset *job_list);
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static void remove_job(struct jobset *j_list, struct job *job);
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static int get_command(FILE * source, char *command);
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@ -177,7 +169,7 @@ static char *local_pending_command = NULL;
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static struct jobset job_list = { NULL, NULL };
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static int argc;
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static char **argv;
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static struct close_me *close_me_head;
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static llist_t *close_me_list;
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static int last_return_code;
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static int last_bg_pid;
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static unsigned int last_jobid;
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@ -251,7 +243,7 @@ static int builtin_exec(struct child_prog *child)
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if (child->argv[1] == NULL)
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return EXIT_SUCCESS; /* Really? */
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child->argv++;
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close_all();
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while(close_me_list) close((int)llist_pop(&close_me_list));
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pseudo_exec(child);
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/* never returns */
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}
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@ -453,11 +445,11 @@ static int builtin_source(struct child_prog *child)
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}
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fd=fileno(input);
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mark_open(fd);
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llist_add_to(&close_me_list, (void *)fd);
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/* Now run the file */
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status = busy_loop(input);
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fclose(input);
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mark_closed(fd);
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llist_pop(&close_me_list);
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return (status);
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}
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@ -472,36 +464,6 @@ static int builtin_unset(struct child_prog *child)
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return EXIT_SUCCESS;
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}
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static void mark_open(int fd)
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{
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struct close_me *new = xmalloc(sizeof(struct close_me));
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new->fd = fd;
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new->next = close_me_head;
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close_me_head = new;
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}
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static void mark_closed(int fd)
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{
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struct close_me *tmp;
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if (close_me_head == NULL || close_me_head->fd != fd)
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bb_error_msg_and_die("corrupt close_me");
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tmp = close_me_head;
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close_me_head = close_me_head->next;
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free(tmp);
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}
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static void close_all()
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{
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struct close_me *c, *tmp;
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for (c=close_me_head; c; c=tmp) {
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close(c->fd);
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tmp=c->next;
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free(c);
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}
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close_me_head = NULL;
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}
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#ifdef CONFIG_LASH_JOB_CONTROL
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/* free up all memory from a job */
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static void free_job(struct job *cmd)
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@ -769,33 +731,29 @@ static char* itoa(register int i)
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static char * strsep_space( char *string, int * ix)
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{
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char *token, *begin;
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begin = string;
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char *token;
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/* Short circuit the trivial case */
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if ( !string || ! string[*ix])
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return NULL;
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/* Find the end of the token. */
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while( string && string[*ix] && !isspace(string[*ix]) ) {
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while( string[*ix] && !isspace(string[*ix]) ) {
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(*ix)++;
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}
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/* Find the end of any whitespace trailing behind
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* the token and let that be part of the token */
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while( string && string[*ix] && isspace(string[*ix]) ) {
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while( string[*ix] && isspace(string[*ix]) ) {
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(*ix)++;
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}
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if (! string && *ix==0) {
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if (!*ix) {
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/* Nothing useful was found */
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return NULL;
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}
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token = xmalloc(*ix+1);
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token[*ix] = '\0';
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strncpy(token, string, *ix);
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token = bb_xstrndup(string, *ix);
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return token;
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}
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@ -980,7 +938,6 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
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int argv_alloced;
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int saw_quote = 0;
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char quote = '\0';
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int count;
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struct child_prog *prog;
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#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
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int i;
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@ -1008,7 +965,7 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
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Getting clean memory relieves us of the task of NULL
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terminating things and makes the rest of this look a bit
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cleaner (though it is, admittedly, a tad less efficient) */
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job->cmdbuf = command = xcalloc(2*strlen(*command_ptr) + 1, sizeof(char));
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job->cmdbuf = command = xzalloc(2*strlen(*command_ptr) + 1);
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job->text = NULL;
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prog = job->progs;
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@ -1209,14 +1166,10 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
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prog->argv[argc_l] = NULL;
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if (!return_command) {
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job->text = xmalloc(strlen(*command_ptr) + 1);
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strcpy(job->text, *command_ptr);
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job->text = bb_xstrdup(*command_ptr);
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} else {
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/* This leaves any trailing spaces, which is a bit sloppy */
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count = return_command - *command_ptr;
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job->text = xmalloc(count + 1);
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strncpy(job->text, *command_ptr, count);
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job->text[count] = '\0';
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job->text = bb_xstrndup(*command_ptr, return_command - *command_ptr);
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}
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*command_ptr = return_command;
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@ -1320,9 +1273,8 @@ static void insert_job(struct job *newjob, int inbg)
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newjob->job_list->fg = thejob;
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/* move the new process group into the foreground */
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/* suppress messages when run from /linuxrc mag@sysgo.de */
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if (tcsetpgrp(shell_terminal, newjob->pgrp) && errno != ENOTTY)
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bb_perror_msg("tcsetpgrp");
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/* Ignore errors since child could have already exited */
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tcsetpgrp(shell_terminal, newjob->pgrp);
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}
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#endif
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}
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@ -1385,7 +1337,8 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
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signal(SIGTTOU, SIG_DFL);
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signal(SIGCHLD, SIG_DFL);
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close_all();
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// Close all open filehandles.
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while(close_me_list) close((int)llist_pop(&close_me_list));
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if (outpipe[1]!=-1) {
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close(outpipe[0]);
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@ -1447,7 +1400,7 @@ static int busy_loop(FILE * input)
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newjob.job_list = &job_list;
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newjob.job_context = DEFAULT_CONTEXT;
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command = (char *) xcalloc(BUFSIZ, sizeof(char));
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command = xzalloc(BUFSIZ);
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while (1) {
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if (!job_list.fg) {
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@ -1464,7 +1417,7 @@ static int busy_loop(FILE * input)
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if (! expand_arguments(next_command)) {
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free(command);
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command = (char *) xcalloc(BUFSIZ, sizeof(char));
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command = xzalloc(BUFSIZ);
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next_command = NULL;
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continue;
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}
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@ -1478,7 +1431,7 @@ static int busy_loop(FILE * input)
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}
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else {
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free(command);
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command = (char *) xcalloc(BUFSIZ, sizeof(char));
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command = (char *) xzalloc(BUFSIZ);
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next_command = NULL;
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}
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} else {
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@ -1607,7 +1560,7 @@ int lash_main(int argc_l, char **argv_l)
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/* These variables need re-initializing when recursing */
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last_jobid = 0;
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local_pending_command = NULL;
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close_me_head = NULL;
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close_me_list = NULL;
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job_list.head = NULL;
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job_list.fg = NULL;
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last_return_code=1;
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@ -1616,12 +1569,11 @@ int lash_main(int argc_l, char **argv_l)
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FILE *prof_input;
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prof_input = fopen("/etc/profile", "r");
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if (prof_input) {
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int tmp_fd = fileno(prof_input);
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mark_open(tmp_fd);
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llist_add_to(&close_me_list, (void *)fileno(prof_input));
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/* Now run the file */
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busy_loop(prof_input);
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fclose(prof_input);
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mark_closed(tmp_fd);
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llist_pop(&close_me_list);
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}
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}
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@ -1664,7 +1616,8 @@ int lash_main(int argc_l, char **argv_l)
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} else if (local_pending_command==NULL) {
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//printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]);
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input = bb_xfopen(argv[optind], "r");
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mark_open(fileno(input)); /* be lazy, never mark this closed */
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/* be lazy, never mark this closed */
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llist_add_to(&close_me_list, (void *)fileno(input));
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}
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/* initialize the cwd -- this is never freed...*/
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